Sains Malaysiana 47(5)(2018): 1033–1038
http://dx.doi.org/10.17576/jsm-2018-4705-20
Peningkatan Kepekaan
Biosensor Urea Berasaskan Resonans
Plasmon Permukaan dan
Tatasusunan Kretschmann dengan Struktur Hibrid Grafin-MoS2
(Sensitivity Enhancement
of Urea Biosensor based on Surface Plasmon Resonance and Kretschmann Configuration with Graphene-MoS2 Hybrid Structure)
NUR AKMAR
JAMIL,
P.
SUSTHITHA
MENON*,
GAN
SIEW
MEI
& BURHANUDDIN
YEOP MAJLIS
Institut Kejuruteraan
Mikro dan
Nanoelektronik (IMEN), Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
Diserahkan: 4 Oktober
2017/Diterima: 29 November 2017
ABSTRAK
Artikel ini menganalisis
biosensor resonans plasmon
permukaan (SPR) dengan
lapisan grafin
yang meningkatkan kecekapan biosensor
urea kerana penerapannya
yang tinggi. Tatasusunan Kretschmann merupakan teknik yang paling berkesan digunakan untuk pengujaan plasmon. Dalam kajian ini, kami menganalisis kesan ekalapisan MoS2 dengan
lapisan grafin
yang didepositkan pada bahan plasmon, iaitu logam emas
(Au),
di dalam tatasusunan
ini. Simulasi untuk menganalisis
tatasusunan ini
adalah berdasarkan kepada kaedah perbezaan
terhingga domain masa (FDTD).
Prestasi biosensor SPR dapat dipantau dengan menganalisis kepekaan dan lebar
penuh pada
separuh maksimum (FWHM)
spektrum SPR. Pengukuran
diperhatikan pada
panjang gelombang 670 nm dan 785 nm untuk pengesanan urea. Indeks molar dan indeks
biasan berbeza
(RI)
daripada 1.335 sehingga
1.342 untuk lapisan
penderiaan. Keputusan menunjukkan peratus peningkatan kepekaan biosensor Au/MoS2/grafin berbanding
biosensor Au konvensional adalah
98% dan 202% masing-masing
pada panjang gelombang
670 nm dan 785 nm. Ini menunjukkan
bahawa cadangan
biosensor SPR
yang novel ini adalah
lebih sensitif untuk pengesanan urea.
Kata kunci:
Biosensor urea; FWHM; resonans plasmon permukaan; simulasi FDTD;
tatasusunan Kretschmann
ABSTRACT
The present paper analyses
a surface plasmon resonance (SPR)
biosensor based on graphene that leads to improvement on the efficiency
of an urea biosensor due to high adsorption. Kretschmann configuration is well known as the most effectively
used technique for plasmon excitation.
In this work, we investigated the effect of MoS2 with
a fine layer of graphene deposited on a plasmonic
material, gold (Au), into the configuration.
Simulation is based on finite-difference time domain (FDTD) method for analysis. The
performance of SPR biosensor can be monitored by analyzing
the sensitivity and full width-at-half-maximum (FWHM)
of the SPR spectrum. The measurements are observed at 670 and 785
nm for urea detection. The molarity and refractive index is varied
from 1.335 to 1.342 for the sensing layer. The results showed
that the percentage increase in sensitivity for the proposed biosensor
Au/MoS2/graphene
over conventional biosensor Au is 98% and 202% at 670 and 785
nm, respectively, which indicates that the proposed novel SPR biosensor is better suited
for urea detection.
Keywords: FDTD simulation; FWHM; Kretschmann configuration;
surface plasmon resonance; urea biosensor
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*Pengarang
untuk surat-menyurat;
email: susi@ukm.edu.my